Abstract: The development process of g.eckloni yolk sac larvae were observed. The results showed that: The water temperature of 14～16 ℃, pH6.1 ~ 7.1, 6.6 ~ 7.6 mg/L dissolved oxygen under the condition of g.eckloni newly hatched larvae was 8.02 ~ 8.31 mm, the body is yellow, sink to the bottom, rely on yolk sac energy; 4 D after hatching, larval dorsal primordium differentiation, a punctate pigmentation appeared between the back of the body sarcomere, and yolk sac 6 D after hatching; flat fish began to swim, and feeding, to reach a total length of 11.93 ~ 12.46 mm.